Cylinder safety means



June 1926.

1,587,513 E. F. DUDLEY CYLINDER SAFETY MEANS Filed Feb. 26, 1923 2Sheefs-Sheet 1 June 8 1926.

mmunmz 1,587,513 E. F. DUDLEY CYLINDER SAFETY MEANS Filed Feb. 26, 19252 Shets-Sheet 2 &

Patented June 8, i926.

UNE'E'ED EDWARD F. DUDLEY, 6F OAK PARK, ILLINOHE. ASSIGNQR PRESS &MANUFACTURING 00., OF CH NOIS.

TO MIEHLE PRINTING ICAGO, ILLINOIS, CORPORATION OF ILLI- CYLINDER SAFETYMEANS.

Application filed February This invention relates to printing pressesand more particularly to safety means for the printing cylinder.

In a co-pending application, Serial No.

546,566, filed jointly on March 25, 1922, by

Burt D. Stevens and me, there is disclosed a vertical type of printingpress in which the printing cylinder, during an upward rectilinearmovement, is connected to driving means for rotating the cylinder forprinting purposes. On the downward rectilinear movement of the cylinder,the latter is held against rotation. Accordingly, means are provided,first, for connecting the cylinder to its rotary driving meanspreparatory to an upward movement of the cylinder, and, second, fordisconnecting said cylinder from said rotary driving means, and holdingthe cylinder against rotation preparatory to its next downward movement.

With the arrangement disclosed in said copending application, it is amechanical possibility for the cylinder to become disconnected from itsrotary driving means during its upward rotative or printing movement.Such an occurrence would be undesirable for it would cause a slidingmovement of the type with respect to the sheet material being impressed,spoiling said sheet if not doing other damage. I

Accordingly, one object of this present in- Y vention is to prevent theprinting cylinder from becoming unlocked from its rotary drivingmechanism during its printing move ment.

Another object is to provide simple and efficient means, not only forthe above mentioned purpose but also to provide such means which willpermit rotative movement of the cylinder to facilitate adjustment of thetympan.

These and other objects are accomplished by means of the arrangementdisclosed on the accompanying sheets of drawings, in which Figure 1 is afragmentary elevational view of a vertical type of printing pressembodying my invention;

Figure 2 is a fragmentary elevational view of a printing cylinderembodying the invention, parts being shown in section for the sake ofclearness;

Figure 3 is a fragmentary sectional view taken in the plane of line 3-3of Figure 2;

as, 1922. Serial miseries.

Figure 4 is a sectional view taken in the plane of line 4-4 of Figure 3;

Figure 5 is a sectional view taken in the plane of line 55 of Figure 2;and

Figure 6 is a fragmentary sectional view similar to that shown in Figure3, and showing, in addition, a dog or pawl connection between thecylinder and its actuating mechanism.

The various novel features of the inven tion will be apparent from thefollowing description and drawings and will be particularly pointed outin the appended claims.

As in said co-pending application, my present invention is illustratedin connection with avertical type of printing press including a baseframe 10 and a way frame 11 mounted upon the former. Vertically movablymounted in the way frame is a type bed, not shown, fpr carrying type ora plate 1:or cooperatingwlth the printing cylinder 12. In thisparticular instance, the type bed and printing cylinder reciprocatevertically simultaneously in opposite directions, as shown in aco-pending application Serial No. 329,976, filed by Edward Cheshire onOctober 11, 1919, the cylinder 12 being rotated during its upward orprinting movement and being held against rotation during its downwardmovement.

In connection with the actuation of the printing cylinder 12, a rack 13reciprocates with the type bed, and a gear 14, associated with thecylinder 12, meshes therewith and is driven thereby. The driving gear 14is loosely or rotatably mounted upon any suitable support or trunnion15. It is apparent therefore, that gear 14 may be rotated as a result ofa relative movement with respect to the rack 13 Without rotary movementbeing transmitted to the cylinder proper. To rotate the cylinder, apositive connection between said cylinder and gear is necessary. Thispositive connection takes the form of a pawl 16 having a head 17 adaptedto pass into the single notch 18 of a ratchet wheel 19. lhe ratchetwheel 19 is secured to, or is formed integrally with, the driving gear14, and the pawl 16 is fixed to a shaft 20 carried between the end wallsof the cylinder, eccentric with respect to the longitudinal center ofsaid cylinder. Accordingly, when the pawl head 17 is held in the notch18 of the disc 19 and the cylinder is travelling vertically, saidcylinder also is caused to rotate. The pawl is pressed against theannular edge of the ratchet wheel 19 and more particularly, the pawlhead 17 is pressed into and held in the notch 18 of the disc 19 by aspring 21, which coiled around a suitably supported rod 22 having apivotal connection with an arm 23, secured to the shaft 20.

As mentioned above, so long as the pawl head 17 remains in notch 18 ofthe disc 19, and the cylinder is moving upwardly, sai d cylinder alsowill be caused to rotate. it is conceivable that during the upwardrotative or printing movement of the cylinder, said cylinder mightbecome disconnected from its driving means or, in other words, the pawlhead 17 might be thrown out of the notch 18, as, for example, if thecylinder should momentarily run faster than the driving gear 14. Thecooperating beveled walls 24 and 25 of the notch 18 and pawl head 17would permit such action, such beveled walls being provided for thepurpose of causing the ready disconnection of said pawl head and notchat the upper limit of movement of said cylinder. If the cylinder shouldbecome disconnected from its rotary driving means during its upw rdprinting movement, it is apparent that the type or plate would slideover the sheet of material carried by the cylinder, spoiling such sheetand possibly doing other damage. Accordingly, to prevent said cylinderfrom being disconnected from its rotary driving means during its upwardrotative movement, I have provided positive means for locking said pawlhead 17 in the said notch 18 during such upward rotative movement of thecylinder. This means takes the form of a collar 26 having an annularlaterally extending flange 27, which cooperates with a roller or stud 28projecting laterally from an arm 29, also secured to the shaft 20. Theflange 27 has a single notch 80 through which the roller or stud 28 maypass inwardly when the pawl head 17 is raised out of the notch 18 at theupper limit of movement of the cylinder. The stud 28 remains within theflange 27 during the downward movement of the cylinder but does notrotate with respect thereto for the reason that the cylinder is notvrotated and the collar 26 carrying the flange 27 is fixed againstrotation on part of the cylinder bearing brack t or frame structure,However, when the cylinder has reached its lower limit of movement andis about to start on its upward printing movement, the pawl head 17passes into the notch 18 and accordingly, the stud 28 moves outwardlythrough the opening 30 in flange 27. As the cylinder rotates under theseconditions, that is, 'ith the stud 28 to the outside of the flange 27,it is apparent that it would be impossible for the pawl head 17 to moveout of the notch 18 to disconnect the cylinder from its drivingmechanism for the reason that the flange 27 will not permit an inwardmovement of the stud 2-8 until the cylinder has completed its upwardrotary printing movement and the stud again is presented to the opening30.

The stud 28 is permitted to rotate within the flange 27 when thecylinder is disconnected from its driving means for the purpose offacilitating the adjustment of the tympan. That is the only time,however, that the stud 28 rotates within the flange 27.

It is my intention to cover all modifications of the invention fallingwithin the spirit and scope of the following claims.

I claim 1. In a printing press, the combination of a cylinder mountedfor rotary movement, driving means therefor, means for connecting saidcylinder and driving means, and unyielding means for positivelypreventing said connecting means from moving from its connectingposition during a rotary movement of said cylinder.

2. In a printing press, the combination of a cylinder mounted for rotaryand another movement, driving means therefor, means for connecting saidcylinder and driving means whereby said cylinder may be rotated, andunyielding locking means for preventing said connecting means frommoving from its connecting position during a rotary movement of saidcylinder.

3. In a printing press, the combination of a cylinder mounted for rotaryand rectilinear movement, driving means therefor, means for connectingsaid cylinder and driving means, and means including an unyieldinglylocked member whereby said connecting means is positively held toprevent it from moving from its functioning position during a rotarymovement of said cylinder.

4. In a printing press, the combination of a cylinder means whereby saidcylinder may be moved in one direction and rotated while moving in saiddirection, and unyielding locking means making it impossible for saidcylinder not to rotate while moving in said direction.

5, In a printing press, the combination of a cylinder capable of rotaryand another movement, means whereby said cylinder moves in one directionand does not rotate while so moving, means whereby said cylinder rotateswhile moving in another direction, and unyieldably locired means makingit impossible for said cylinder not to rotate when moving in said otherdirection.

6. In a printing press, the combination of a printing cylinder, adriving member therefor, a ratchet and pawl connection between saidcylinder and driving member whereby said cylinder may be rotated, andmeans including two members in unyieldable engagement for positivelylocking said ratchet and pawl in functioning position during anoperating movement of said cylinder.

7. In a printing press, the combination of a cylinder, a shaft carriedby said cylinder, a pawl mounted on said shaft, a driving gearrelatively movable with respect to said cylinder and operativelyassociated with said pawl whereby when said pawl is in a given positionsaid cylinder may be rotated, and means including unyieldablyinterlocked members for positively preventing said pawl from moving intoa non-functioning position during a rotative movement of said cylinder.

8. In a printing press, the combination of a cylinder, a shaft carriedby said cylinder, a pawl mounted on said shaft, a driving gearrelatively movable with respect to said cylinder and operativelyassociated with said pawl whereby when said pawl is in a given positionsaid cylinder may be rotated, a flanged member, and an arm mounted onsaid shaft cooperating with said flanged member to hold the pawl inlocked position for preventing the cylinder from not rotating during aprinting movement thereof.

Signed at Chicago, Illinois, this 21st day of February, 1923.

EDWARD F. DUDLEY.

